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20 July, 04:14

Find the product mentally.

(2j + 7) (2j - 7)

A: 4j2 + 49

B: 4j2 - 49

C: 2j2 - 28j - 49

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Answers (1)
  1. 20 July, 07:45
    0
    (2j+7) (2j-7)

    = (2j+7) (2j+-7)

    = (2j) (2j) + (2j) (-7) + (7) (2j) + (7) (-7)

    =4j2-14j+14j-49

    =4j2-49
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